Adding module dependency information in sbt's build.sbt file - scala

Question

I have a multi module project in IntelliJ, as in this screen capture shows, contexProcessor module depends on contextSummary module.
IntelliJ takes care of everything once I setup the dependencies in Project Structure.
However, when I run sbt test with the following setup in build.sbt, I got an error complaining that it can't find the packages in contextSummary module.
name := "contextProcessor"
version := "1.0"
scalaVersion := "2.11.7"
libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.2" % "test"
How to teach sbt that the missing modules are found?

Answer 1

I could use the build.sbt file in the main root directory.
lazy val root = (project in file(".")).aggregate(contextSummary, contextProcessor)
lazy val contextSummary = project
lazy val contextProcessor = project.dependsOn(contextSummary)
Reference: http://www.scala-sbt.org/0.13.5/docs/Getting-Started/Multi-Project.html
For testing only one project, I can use project command in sbt.
> sbt
[info] Set current project to root (in build file:/Users/smcho/Desktop/code/ContextSharingSimulation/)
> project contextProcessor
[info] Set current project to contextProcessor (in build file:/Users/smcho/Desktop/code/ContextSharingSimulation/)
> test
For batch mode as in How to pass command line args to program in SBT 0.13.1?
sbt "project contextProcessor" test

Answer 2

I think a simple build.sbt might not be enough for that.
You would need to create a more sophisticated project/Build.scala like that:
import sbt._
import sbt.Keys._
object Build extends Build {
lazy val root = Project(
id = "root",
base = file("."),
aggregate = Seq(module1, module2)
)
lazy val module1 = Project(
id = "module1",
base = file("module1-folder"),
settings = Seq(
name := "Module 1",
version := "1.0",
scalaVersion := "2.11.7",
libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.2" % "test"
lazy val module2 = Project(
id = "module2",
base = file("module2-folder"),
dependencies = Seq(module1),
settings = Seq(
name := "Module 2",
version := "1.0",
scalaVersion := "2.11.7",
libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.2" % "test"
}